No, they are not. In fact, they contain both meat and dairy.
Here is their product description . . .
"At this time, none of our menu items are certified as vegetarian or vegan."
The oil our suppliers use to partially fry our World Famous Fries has a natural beef flavoring, which also contains hydrolyzed milk as a starting ingredient, added to enhance the taste.
- source: www.mcdonalds.com/
http://www.mcdonalds.com/content/us/en/your_questions/our_food/are-your-fries-vegetarian-friendly.html
